BASIC ELECTRICAL TROUBLESHOOTING

TROUBLE SHOOTING WORKS

In this article we can clearly find out the problems and its solutions

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CT CIRCUITS

S/No.	Probable Trouble	Cause / Works to be attended
	CT Circuits
1	Noise in CT	- Open circuit of secondary circuit
		- Loose connections in secondary circuit
		- Ammeter switch fault causing open circuit in CT secondary
2	Ammeter is not recording	- Ammeter may be faulty
		- Ammeter switch is not making contact

PT CIRCUITS

S/No.

Probable Trouble

Cause / Works to be attended

1	Voltmeter not showing correct reading	- Check fuses
		- If above is OK, voltmeter may be faulty
		- Loose connections in PT circuit
2	Energy meters recording on lesser side	- CT secondary circuit may be in shorting position for one or two phases
		- PT circuit fuse may be blown
		- Loose connections
		- Energy meter may be faulty

D.C PROTECTION CIRCUITS

S/No.

Probable Trouble

Cause / Works to be attended

1	Non working of trip healthy indication	- Fusing of bulb or bulb may be fitted loose
		- Loose connections
		- Resistance may be open circuited
		- Misalignment of auxiliary contacts of breaker
		- D.C. fuse may be loose or blown off
		- Trip coil is open
		- Push button may be faulty

2	Non tripping of breaker	- D.C. fuse may be loose or blown off
		- Loose connections
		- Trip coil is open or burnt
		- Misalignment of auxiliary contacts of breaker
		- No free movement of plunger of trip coil
		- Mechanical trouble in breaker
		- Trip switch or Push button may be faulty
		- Air pressure may be low in case of pneumatic operated breaker. If low, correct it
		- Check the circuit as per circuit diagram
3	Non closing of breaker	- D.C. fuse may be loose or blown off
		- Loose connections
		- Close coil is open or burnt
		- Misalignment of auxiliary contacts of breaker
		- No free movement of plunger of close coil
		- Mechanical trouble in breaker
		- Spring might not have been charged
		- Non resetting of Master / Trip relay
		- Non closing from remote end, if Local / Remote switch on local position
		- Closing switch or Push button may be faulty
		- Check the circuit as per circuit diagram
4	Tripping of breaker without Indication	- Due to shorting of D.C Positive
		- D.C. leakage

5	Mal-operation of Relay	- Defect in relay or setting, If relay is defective, relay needs to be replaced
		- Wiring connection problem
6	Relay Flag not resetting	- Mechanical defect in the flag mechanism
7	Spring charging motor does not start	- Either loose fitting of fuse and link or blowing of fuse
		- Loose connections
		- Failure of A.C. or D.C. supply
		- Misalignment or defective limit switch of Spring charging mechanism
		- Defective motor

ANNUNCIATION CIRCUITS

S/No.

Probable Trouble

Cause / Works to be attended

1	Non working of Bell	- Either loose fitting of fuse and link or blowing of fuse
		- Loose connections
		- Burning of Bell coil
		- Disturbance in bell adjustment
		- Aux. relay provided may not working
		- Sealing (hold on) supply getting to the aux. relay through ‘accept’ push button might have disconnected due to faulty ‘accept’ push button
2	Continuous ringing of Bell	- D.C. leakage
		- Disturbance in aux. relay contacts adjustment
3	Non resetting of Bell	- Accept push button faulty
		- D.C. leakage
		- Aux. relay faulty
4	Non resetting of Indication	- Reset push button faulty
		- D.C. leakage

INDICATION CIRCUITS

S/No.

Probable Trouble

Cause / Works to be attended

1	Lamp not indicating for breaker ON-OFF position	- Either loose fitting of fuse and link or blowing of fuse
		- Lamp may be loose fitted or fusing of lamps
		- Loose connections
		- Defective aux. switch contacts of breaker
2	Semaphore not working	- Either loose fitting of fuse and link or blowing of fuse
		- Semaphore coil might have burnt
		- Loose connections
		- Defective aux. switch contacts of breaker or Isolator/Earth switch, as applicable